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<html lang="en">
<head>
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    <title>Document</title>
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<body>
    <script>
 var num = Number(prompt('撒大苏打年')); 
 var ste = 1;
while(num<=10 && num>=1){
     ste *= num  
       num--
}

 console.log(ste)

    </script>
</body>
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